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Intrinsic noise INA bearings are bearings using modern processing technology manufacturing will still occur, noise decided INA bearing imports its structure. Intrinsi. Intrinsic noise can be divided into rolling impact sound sound, rolling body and rolling sound three, as follows:
(1) INA import bearing raceway and its control method
Rolling road sound is when the carrier rotates, the rolling element rolling and making a slippery continuous sound in the raceway surface, is a basic sound unique to all rolling INA bearing imports will happen. Bearings generally sound is rolling road sound with other sounds.
Ball bearing raceway is irregular, frequencies above 1000Hz, the frequency rate does not change with the speed, but the overall sound pressure level increases with acceleration of the speed.
Raceway INA loud imported bearing, the raceway acoustic sound pressure level decreases as the viscosity increased; and the rolling INA bearing imports say small, the sound pressure level in the viscosity increases to about 20mm2/s above, by a reduction to increase.
INA bearing imports a large rigidity, rolling road sound of a sound pressure level is low. Such as the radial clearance is too small, rolling road sound of a sound pressure level and frequency with reduced radial clearance and increased dramatically.
Control of raceway acoustic methods are: selection of low noise INA bearings imported bearings which waviness small, carefully select the use conditions. Rolling road sound often affects the entire mechanical noise, reduce the raceway can reduce the noise of the whole machine.
(2) the impact of noise and its control method of rolling
The larger size ball bearings or cylindrical roller INA INA import bearings under purely radial load and low speed operation, due to the centrifugal force of the rolling small, in the non load rolling will impact the holder or rolling road noise. But with the increase of rotational speed, the noise will disappear.
On the rolling control method for impact sound: appropriate reduction of radial clearance, the use of reasonable structure and materials to keep INA bearing imports rack compliant.
(3) a creak INA imported bearings and its control method
Creak metal friction sound cylindrical roller bearings are likely to occur in all cases of harsh, mostly in the larger models INA import grease lubricated bearings, and in the grease base oil deterioration in more easily, almost does not occur under oil lubrication. In addition, more vulnerable in the winter, when under purely radial load, prone to big occasions in a radial clearance, and with different model sizes, easy to occur within a specific speed range, both continuous and intermittent. The outer ring raceway special processing methods can prevent creak appears, when necessary, can choose this kind of bearing, or appropriate reduction of radial clearance INA imported bearings, using high performance greases and improve and INA import bearings to match the mechanical rigidity.